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Finding the Fourth Proportional to 61,315.20, 91,972.80 and 30,211.20

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Solution

The fourth proportional to 61,315.20, 91,972.80 and 30,211.20 is: 45,316.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,315.20 : 91,972.80 = 30,211.20 : x
  2. Step 2: Convert to fraction form
    61,315.20/91,972.80 = 30,211.20/x
  3. Step 3: Cross multiply
    61,315.20x = 91,972.80 × 30,211.20
  4. Step 4: Simplify right side
    61,315.20x = 2,778,608,655.36
  5. Step 5: Solve for x
    x = 2,778,608,655.36/61,315.20
  6. Step 6: Final answer
    x = 45,316.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.